A fired Upper East Side toy-store manager is suing her former boss, alleging he forced her into a kinky quid pro quo — having “rough” sex twice weekly in exchange for a promotion and perks.

Amanda Reyes, 26, of Queens, was subjected to a “master-and-servant-like” relationship by Steven Reis, owner of Fantastic Kids Toys on Third Avenue near 84th Street, according to her lawyer, Walker G. Harman Jr.

Reyes filed her lawsuit in Manhattan Supreme Court.

Reached at his Yorkville shop yesterday, Reis called the allegations “false.”